Drag-saw



(NoModel.) o.. S. NEWCOMB. z'sneets-sheet 1 IIIIIIII WITJVESSES willful-r- (No Model.) 0' 2 Sheets-Sheet. 2.

. DRAG SAW'. O75.

Patented Deo. 30, 1884.

' Illini-$313975! :E lIIl l Nrrnn STATES OSCAR S. NEVVCOMB, OF HESPERIA, MICHIGAN.

DRAG-SAW.

SPECIFICATION forming part of Letters Patent No. 310,075, dated December 30, 1884.

Application filed March 15, 1881. (No model.)

To aZZ whom t may concern:

Be it known that I, OsoAR S. NnwooMB, a citizen of the United States of America, residingrat Hesperia, in the county of Oceanaand State of Michigan, have invented certain new and useful Improvements in food Sawing Machines 5 and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable lothers skilled in the art to which it appertains to make and use the same, reference being had to theac companying drawings, and to letters or iigures of reference marked thereon,whieh form a part of this specification.

My invention relates to log'sawin g machines; and it consists in the improvements hereinafter fully described and set forth.

In the accompanying drawings, forming part of this specification, Figure l is a side view of a sawing-machine constructed in accordance with my invention. Fig. 2 is a plan view of Fig. l, parts being removed. Fig. 3 is a longitudinal section, and Fig. 4 isafront elevation.

The frame of the sawing-machine consists of side bars, A, and front and rear end hars, B. Standards C are secured centrally on the upper sides ofthe side bars, A, and are perforated for the passage of ashaft, a, having its ends bent to form crank-handlesa. The said shaft a has keyed thereon a pinion, b, and has loosely thereon a hub or sleeve, c, from which extends an arm, D, provided with a slot, d, at its lower end, and transversely perforated thereat. An arm, E, integral with the arm vD,extends at right angles from the central portion of said arm D, as shown in Fig. 3. A sleeve, F, turns on a shaft, @,whiehbears at its ends in the upper portions of the standards C. Integrall y extending rearwardly from the center of said sleeve F is an arm, G. A shaft, f, is journaled in the rear portion of the side bars, A, and is bent at its center to form a crank, g. A rod, H, connects the crank g with the rear extremity of the arm G. A connecting-bar, I-I, is pivotally attached at oney end to the center of the arm G, and at its other end to the extremity of the arm E. The said connecting-bar H is composed of two independent sections, hh', each of which is provided with a shoulder, h2 7L, against which the end of the other section bears. Each of said sections is provided with an elongated slot registering with one another, and through these slots pass one or more bolts, ,on the threaded endsof which engage clam p nuts j, which secure said sections 7i h together, but permit their longitudinal adjustment with respect to each other, so as to effect the extension of the bar H. The cra nk-shaft-f has keyed thereon at one side thereof a pinion, 7c, and upon the projecting end of the said crank-shaft is keyed the ily or balance wheel. A train of gear-wheels, l Z, convey motion from the piu ion b on the shaft a to the said pinion Bearing loosely on the end of thershaft m of the pinion Z is a lever, L, carrying at one end a brake-shoe, M, which can, when desired, be applied to the periphery of the wheel to retard the movement thereof. A shaft, a, bearing in brackets s'secured at the under side of the frame, and carries a pinion, N, which meshes with the teeth of the pinion l. The said shaft carries a band-pulley at one side, by which the machine can be readily belted to be driven from any suitable motor. The front portions of the bars A and extensions of the stadards C are curved to form yoke-armsO O', connected to each other by means of vertical rods 0,whieh pass through and serve as guides for horizontal bars p, connected together by means of parallel vertical bars q, in which are journaled rollers r, between which play the edges of the smooth portion of a saw-blade, I?, pivotally connected at the lower end of the bar D. An iron or rod, s, is secured pivotally at each end to the outer side of the bars q, and is bent in the form of an inverted yoke, t, at its front end to rest on the saw-blade l? andprcventlateral play of the same. A loop, a, located centrally on the upper side of the bar p, has attached thereto a cord, @,whieh passes up over pulleys lw, located in the bar O, and hangs pendent from one side of the same, and carries a loop by which it can be pulled to elevate the sawguiding frame formed by the bars p q. -A metallie handle, S, is provided with bifureated extensions x, through which passes one of the rods o, the said extensions being located immediately between the ends of the bars p, as shown in Fig. 4, so that by manipulating said handle S the saw-guide frame can be elevated thereby independent ot" the cord o.

The operation of the machine will. be obvions. Suiiice to say that the various drive and leear connections rotate the erank-shal'tg, thereby intermittently elevating and depressi ng the connecting-arm lgl,vibrating,r the shaft G, and horizontally reciprocating the saw l? by means ot" the arm and bar connection D lil.

The operation and purpose of the devices located at the iront ofthe machine have al ready been explained.

By adjusting;n the nuts and bolt-s that secure the sections v? 1'/ together the connecting-bar ll connected thereby may be readily increased or decreased in length, so as to vary the vibration imparted io the arm and bar l) E, and consequently the reciprocating movement of the saw.

I am aware that previous to my invention it has been proposed to employ adi ustable eXtensible levcrs connected directly to the sawblade7 and operated directly by a handle connected to said lever, and, `further7 that crank mechanism and gear of various styles `for driving saw-blades are old. Moreover, I am conversant with certain p rior patents wherein saw supporting' and guiding1 frames are described and illustrated. I therefore mali1 e no broad claim to any ol" these features.

l claim-M 1l. The combination, in a sawing-niachine,of a frame7 saw devices supported and operatingtherein, crank mechanism carried by said frame, gear-Wheels mounted upon shafts bearing,` in said frame and operated by said crank mechanism, a bar connecting said saw devices and gear-Wlieels,and composed of independent sections secured by bolts, each section being,- longitudinally adjustable with respect to the other, so that the movement of the saw can be regulated Without varying the speed oi' the driving-gear, substantially as set forth.

2. The combination, in a sawing-machine, of an angle-arm, D E, hung loosely on a shaft, a series of multiplying gear-wheels connected adjustably to said angle-arm by an extensible arm7 lill', and a saw guided at the front ofthe machine in a vertically-adjustable frame containing rollers o' fr, for the purpose described, and connected to the angle-bar7 substantially as set forth.

ln testimony whercol1 l allix my signature in presence ol two witnesses.

OSCAR S. 'lllilltftltll l. 

